exports.article = (req,res)=> { 
    let article = global.dbHelper.getModel('article'); 
    let id = req.query.id;
    article.findOne({_id:id},(error,doc) =>{

        if (error) {
     	      res.json({
	 	 		        "code": 500,
	 	 		        "msg":"查找失败"
	       	  })
        }else{
        	  res.json({
      	 	 	   	"code": 200,
      	 	 		  "msg":"查找成功",
      	 	 		  "result":doc
      	    })
        }
    })
}